Words related to *akwa-
"water," late 14c., from Latin aqua "water; the sea; rain," from PIE root *akwa- "water." Used in late Middle English in combinations from old chemistry and alchemy to mean "decoction, solution" (as in aqua regia, a mix of concentrated acids, literally "royal water," so called for its power to dissolve gold and other "noble" metals). As the name of a light greenish-blue color, 1936.
1830, noun use of neuter of Latin aquarius "pertaining to water," as a noun, "water-carrier," genitive of aqua "water" (from PIE root *akwa- "water"). The word existed in Latin, but there it meant "drinking place for cattle." Originally especially for an artificial pond growing aquatic plants; of indoor "ocean gardens" by 1853. The Victorian mania for indoor aquariums began with the book "The Aquarium," published 1854 by English naturalist Philip Henry Gosse. An earlier attempt at a name for "fish tank" was marine vivarium.
Aquarians were a former Christian sect that used water instead of wine at the Lord's Supper. Aquarian Age (alluded to from 1913) is an astrological epoch (based on precession of the equinoxes) supposed to have begun in the 20th century (though in one estimate, 1848), embodying the traits of this sign and characterized by world peace and human brotherhood. It would last approximately 2,160 years. The term and the concept probably got a boost in popular use from the rock song Age of Aquarius (1967) and when An Aquarian Exposition was used as the sub-name of the Woodstock Music & Art Fair (1969).